Question: when did Birgit Nilsson received the award of Leonie Sonning Music Prize?
Paraphrase: Name the date Birgit Nilsson received the award of Leonie Sonning Music Prize.
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q233951 p:P166 ?s . ?s ps:P166 wd:Q1165751 . ?s pq:P585 ?value}